Android版本更新

首先下载apk，自己写个json串放到服务器里面

以下json串为例:
{“versionCode”:2,”des”:”新版本，更炫，更酷！”,”url”:”http://169.254.68.173:8080/demo.apk“}

/**
     * 版本更新
     */
    private void update() {
        // 1.获得最新版本
        HttpUtils httpUtils = new HttpUtils(5000);
        httpUtils.send(HttpRequest.HttpMethod.GET, "http://169.254.68.173:8080/json.json", new RequestCallBack<String>() {

            @Override
            public void onFailure(HttpException arg0, String arg1) {
                Toast.makeText(TextActivity.this, "服务器异常", Toast.LENGTH_SHORT).show();
                redirect();
            }

            @Override
            public void onSuccess(ResponseInfo<String> arg0) {
                //获取最新版本号
                String json = arg0.result;
                try {
                    JSONObject jsonObject = new JSONObject(json);
                    int newCode = jsonObject.getInt("versionCode");
                    url = jsonObject.getString("url");
                    System.out.println(url);

                    //2.获得当前版本号
                    int currentCode = getCurrentCode();

                    if(currentCode<newCode){
                        //3.弹窗
                        AlertDialog.Builder builder = new AlertDialog.Builder(TextActivity.this);
                        builder.setTitle("版本更新");
                        builder.setMessage(jsonObject.getString("des"));
                        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                //取消更新
                                dialog.dismiss();

                                redirect();
                            }
                        });
                        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                //4.下载apk
                                install();
                            }
                        });

                        builder.show();

                    }else{
                        Toast.makeText(TextActivity.this, "已经是最新版本", Toast.LENGTH_SHORT).show();
                    }


                } catch (JSONException e) {
                    e.printStackTrace();
                }




            }
        });

    }

    /**
     * 获取版本号
     */
    public int getCurrentCode(){
        PackageManager packageManager = getPackageManager();
        try {
            PackageInfo packageInfo = packageManager.getPackageInfo(getPackageName(), 0);
            return packageInfo.versionCode;

        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }

        return -1;
    }
    /**
     * 跳转
     */
    public void redirect(){

        new Thread(){
            public void run() {
                SystemClock.sleep(2000);

                Intent intent = new Intent(TextActivity.this, MainActivity.class);
                startActivity(intent);
                finish();//跳转
            };
        }.start();

    }
    /**
     * 下载apk
     */
    public void install(){
        HttpUtils httpUtils = new HttpUtils(5000);
        httpUtils.download(url, "/mnt/sdcard/demo.apk", new RequestCallBack<File>() {


            @Override
            public void onFailure(HttpException arg0, String arg1) {
                Toast.makeText(TextActivity.this, "下载失败", Toast.LENGTH_SHORT).show();
                System.out.println(url);
                redirect();
            }

            @Override
            public void onSuccess(ResponseInfo<File> arg0) {
                // 跳转到系统安装页面
                Intent intent = new Intent();
                intent.setAction("android.intent.action.VIEW");
                intent.addCategory("android.intent.category.DEFAULT");
                intent.setDataAndType(Uri.fromFile(arg0.result),
                        "application/vnd.android.package-archive");
                startActivityForResult(intent, 0);// 如果用户取消安装的话,
                // 会返回结果,回调方法onActivityResult
            }

        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        redirect();

    }

运行时要启动服务器 Tomcat bin start.up